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Available memory?

 
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Shapyi



Joined: 25 Apr 2005
Posts: 95
PostPosted: Sat Feb 16, 2008 9:16 am    Post subject: Available memory? Reply with quote
I wrote a basic program that uses the graphics source code from Lua Player (graphics.h) and I am using psplink to play around. Before running the code I run "meminfo" and get:

Code:
Memory Partitions:
N |    BASE    |   SIZE   | TOTALFREE |  MAXFREE  | ATTR |
--|------------|----------|-----------|-----------|------|
1 | 0x88000000 |  3145728 |    410112 |    396288 | 000C |
2 | 0x08800000 | 25165824 |  25069056 |  25069056 | 000F |
3 | 0x88000000 |  3145728 |    410112 |    396288 | 000C |
4 | 0x88300000 |  1048576 |   1048576 |   1048576 | 000C |


Then I run the program, load a small image (32 x 32 jpeg) and get:

Code:
Memory Partitions:
N |    BASE    |   SIZE   | TOTALFREE |  MAXFREE  | ATTR |
--|------------|----------|-----------|-----------|------|
1 | 0x88000000 |  3145728 |    403968 |    396288 | 000C |
2 | 0x08800000 | 25165824 |   1209856 |    951808 | 000F |
3 | 0x88000000 |  3145728 |    403968 |    396288 | 000C |
4 | 0x88300000 |  1048576 |   1048576 |   1048576 | 000C |


Where did all the memory go? How did it go from 25,069,056 bytes to a mere 1,209,856 bytes? I tried just initializing the the graphics and loading no images and got:

Code:
Memory Partitions:
N |    BASE    |   SIZE   | TOTALFREE |  MAXFREE  | ATTR |
--|------------|----------|-----------|-----------|------|
1 | 0x88000000 |  3145728 |    403968 |    396288 | 000C |
2 | 0x08800000 | 25165824 |  23298560 |  22088704 | 000F |
3 | 0x88000000 |  3145728 |    403968 |    396288 | 000C |
4 | 0x88300000 |  1048576 |   1048576 |   1048576 | 000C |


Is 'meminfo' accurate and the graphics code just wastes 20+ MB of RAM just to load a simple image? Is there any other way to get an accurate reading of the available memory?

Thank you.
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weltall



Joined: 20 Feb 2004
Posts: 310
PostPosted: Sat Feb 16, 2008 5:39 pm    Post subject: Reply with quote
depending on how your application is done it could be malloc alloching all the available ram to manage it by itself: in this case you won't be able to get from system runtimes the status of the ram. there were some little function who did little malloc operations till fulfilling the alloched block to get the size allocable (and so the size available trough malloc). obviously if this is the case the maximum you can use trough malloc is the size which you found missing
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